title: Enhanced 2,3-butanediol production by Klebsiella pneumoniae SDM.
abstract: Enhanced 2,3-butanediol (BD) production was carried out by Klebsiella pneumoniae SDM. The nutritional requirements for BD production by K. pneumoniae SDM were optimized statistically in shake flask fermentations. Corn steep liquor powder and (NH(4))(2)HPO(4) were identified as the most significant factors by the two-level Plackett-Burman design. Steepest ascent experiments were applied to approach the optimal region of the two factors and a central composite design was employed to determine their optimal levels. The optimal medium was used to perform fed-batch fermentations with K. pneumoniae SDM. BD production was then studied in a 5-l bioreactor applying different fed-batch strategies, including pulse fed batch, constant feed rate fed batch, constant residual glucose concentration fed batch, and exponential fed batch. The maximum BD concentration of 150 g/l at 38 h with a diol productivity of 4.21 g/l h was obtained by the constant residual glucose concentration feeding strategy. To the best of our knowledge, these results were new records on BD fermentation.
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, People's Republic of China.
authors.forename: Cuiqing
authors.initials: C
authors.lastname: Ma
authors.forename: Ailong
authors.initials: A
authors.lastname: Wang
authors.forename: Jiayang
authors.initials: J
authors.lastname: Qin
authors.forename: Lixiang
authors.initials: L
authors.lastname: Li
authors.forename: Xulu
authors.initials: X
authors.lastname: Ai
authors.forename: Tianyi
authors.initials: T
authors.lastname: Jiang
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Tang
authors.forename: Ping
authors.initials: P
authors.lastname: Xu
mesh_terms: D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002072:Butylene Glycols / Q000378:metabolism*; D005285:Fermentation; D007218:Industrial Microbiology; D007711:Klebsiella pneumoniae / Q000302:isolation & purification / Q000378:metabolism*; D008969:Molecular Sequence Data; D012988:Soil Microbiology
chemical_list: D002072:Butylene Glycols; C026978:2,3-butylene glycol